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Derivative Instruments and Hedging Activities - Summary of Notional Amounts for Hedged Items, Designated as Hedge Accounting (Detail) - Designated as Hedging Instrument [Member] - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
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Liabilities Derivatives - Interest Rate and Cross Currency Swaps [Member] | Cash Flow Hedge [Member] |  |
Derivative [Line Items] |  |
Notional amounts of hedge | $ 588 | $ 588
Liabilities Derivatives - Interest Rate and Cross Currency Swaps [Member] | Net Investment Hedge [Member] |  |
Derivative [Line Items] |  |
Notional amounts of hedge | 1,000 | 1,000
Asset Derivatives - Options and Forward Contracts [Member] | Fair Value Hedge [Member] |  |
Derivative [Line Items] |  |
Notional amounts of hedge | $ 500 | $ 500

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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